Drivers around Amsterdam are already benefiting from variable message sign (VMS) roadside traffic information installed as part of a strategic traffic management system. During the morning peak period, the A9 road, which runs past the A10 ring road, is congested. However, many drivers are choosing alternative routes before becoming caught in this traffic jam. This is because 14 Dynamic Route Information Panel (DRIP) VMS displays have been installed on the A10; a few dozen more are planned for the near future. Already, drivers who travel to and from Amsterdam on all the main arteries are informed of problems and traffic congestion ahead. The DRIPs incorporate some of the latest developments in LED technology, and their performance exceeds that specified by current European Standards. Special emphasis was placed on their contrast ratio, character configuration, reliability, product lifetime, and relevant financial aspects. The DRIP displays have a continuous line matrix layout, which allows characters to be shown with proportional spacing and graphical symbols to improve their readability. In general, LEDs are being favoured more for traffic signals and for existing VMS signs and traffic lane controllers. The requirements of new European regulations make fibre optics more problematic for the latter.
Samenvatting